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Gold Prospecting
Metal Detecting for Gold
What's Magnetic, But Not Picked Up By A Metal Detector?
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<blockquote data-quote="Hawkear" data-source="post: 643059" data-attributes="member: 4728"><p>Hi Big.nug.business. </p><p>Just revisiting your thread and wondering if you've had any resolution on the magnetic but non detectable "metal" you found.</p><p>I Have a few ideas like ferrite or plain ironstone with a lustrous interior. Ferrite or ironstone as we all know can be picked up on our pick magnets but if our detector is properly ground balanced will tune out the signal.</p><p>Also have seen bits of metal radiator heating elements not give any or only weak signals and even gold nuggets that do the same. The nuggets which did that were very spongy and probably acting like coils in having their decay signals all over the place cancelling out signals from other parts of the spongy gold or coil.</p><p>As an aside possibly this phenomenon may be related to why we sometimes get "warbling" signals from gold (and other targets), in getting competing signals from different parts of a nugget. ie a large signal (down tone) from the more massive part of a nugget and a small signal (up tone) from the smaller part of the nugget. </p><p>Maybe its only me but get frustrated when an item is put up for identification and then after people venture some ideas nothing more is heard or if an identification has been made it has not been shared.</p><p>Hope you have enough posts now to allow you to provide a picture of the item so we can provide some better guesses.</p></blockquote><p></p>
[QUOTE="Hawkear, post: 643059, member: 4728"] Hi Big.nug.business. Just revisiting your thread and wondering if you've had any resolution on the magnetic but non detectable "metal" you found. I Have a few ideas like ferrite or plain ironstone with a lustrous interior. Ferrite or ironstone as we all know can be picked up on our pick magnets but if our detector is properly ground balanced will tune out the signal. Also have seen bits of metal radiator heating elements not give any or only weak signals and even gold nuggets that do the same. The nuggets which did that were very spongy and probably acting like coils in having their decay signals all over the place cancelling out signals from other parts of the spongy gold or coil. As an aside possibly this phenomenon may be related to why we sometimes get "warbling" signals from gold (and other targets), in getting competing signals from different parts of a nugget. ie a large signal (down tone) from the more massive part of a nugget and a small signal (up tone) from the smaller part of the nugget. Maybe its only me but get frustrated when an item is put up for identification and then after people venture some ideas nothing more is heard or if an identification has been made it has not been shared. Hope you have enough posts now to allow you to provide a picture of the item so we can provide some better guesses. [/QUOTE]
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Gold Prospecting
Metal Detecting for Gold
What's Magnetic, But Not Picked Up By A Metal Detector?
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